Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 18 - Nuclear Chemistry - Questions for Review and Thought - Topical Questions - Page 817b: 32


4.0 years

Work Step by Step

After one half-life, the radioactive isotope decays to 50% of its radioactivity. After 2 half-lives, it decays to 25% of its radioactivity and after 3 half-lives it decays to 12.5% of its radioactivity. $\implies$ 3 half-lives=12 years or 1 half-life= 4.0 years.
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